#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <UniversalTelegramBot.h>

#define WIFI_SSID "network"
#define WIFI_PASSWORD "123456789"
#define BOT_TOKEN "6168635844:AAGoo6CZQ-AjTwSeS_-D0SrABzKMZDX8E4A"
String chat_id = "473975732";

#define gasSensorPin 34
#define ledPin       15

WiFiClientSecure secured_client;
UniversalTelegramBot bot(BOT_TOKEN, secured_client);


void setup() {
  Serial.begin(9600);
  pinMode(gasSensorPin, INPUT);
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, 0);
  connectToWiFi();
  bot.sendMessage(chat_id, "ESP32 is Online");
  delay(1000);
}

void loop() {
  int gasSensor = analogRead(34);
  Serial.println(gasSensor);
  if (gasSensor > 2000) {
    digitalWrite(ledPin, 1);
    bot.sendMessage(chat_id, "Alert Gas Detected!!");
    delay(1000);
  }
  else {
    digitalWrite(ledPin, 0);
  }
  delay(1000);
}


void connectToWiFi() {
  Serial.print("Connecting to Wifi SSID ");
  Serial.print(WIFI_SSID);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  secured_client.setCACert(TELEGRAM_CERTIFICATE_ROOT);
  while (WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(500);
  }
  Serial.print("\n");
  Serial.print("WiFi connected. IP address: ");
  Serial.println(WiFi.localIP());


  Serial.print("Retrieving time: ");
  configTime(0, 0, "pool.ntp.org");
  time_t now = time(nullptr);
  while (now < 24 * 3600)
  {
    Serial.print(".");
    delay(100);
    now = time(nullptr);
  }
  Serial.println(now);

}